Air jet for sandblasting apparatus



0, 1940. E. J. FLAVIN 2,212,158

A'IR JET FOR SANDBLASTING APPARATUS 'Filed Feb. 8, 1939 2 Sheets-Sheet 1 0,? 2 CU VOJ- OFJ/M O Inventor fan/M0 J FLA V/N,

Attorneys i- 20, 1940- E. .1. FLAVIN 2,212,158

AIR JET FOR SANDBLASTING APPARATUS 7 Filed Feb. 8. 1939 2 Sheets-Sheet 2 EDWARD J. HAW/v,

By 2mm Attorneys Patented Aug. 20, 1940 UNITED STATES "PATENT OFFICE" 1 Claim.

This invention appertains to new and useful improvements in sandblasting apparatus and more particularly to an air jet for use in conjunction therewith.

In large dam construction projects many thousand square feet of concrete must be sandblasted.

as course upon course of concrete work is built up, so that there will be perfect bondage between the courses. In starting a dam project and during construction work thereon, a trestle is located over the operations and upon this rolling stock is moved to aposition over any point t which materials must be delivered.

An important object is to provide a. sandblasting apparatus which will involve a hopper adapted to be suspended from the trestle of a dam construction, and which has a sand supply line capable of being readily decreased in length as upward progress in construction of the dam takes place.

Another important object of the present invention is to provide an air jet for sandblasting apparatus which in use will serve to deliver compressed air or other fluid under pressure at right angles to the sand feed line.

Other objects and advantages of the invention will become apparent to the reader of the following specification.

In the drawings:

Figure 1 represents a side elevational view of the jet incorporated in an air feed line and sand supply line- Figure 2 is a vertical sectional view through the jet showing the same built into a T-fitting.

Figure 3 is a section on the line 3--3 of Figure 2.

Figure 4 is a vertical sectional View. showing the jet built into an elbow.

Referring to the drawings wherein like numer- 40 als designate like parts, it can be seen in Figure 1 that numeral 5 represents the sand hopper which has the top screen 6 and which is connected by bolts and flanges I to the down pipe 8. This down pipe 9 is connected by bolts and flanges 9 to the quick-acting valve unit In, and the latter remains suspended from the trestle (not shown) until such time as the blasting jet 24 approaches the trestle, at which time more space is required. At this time the large hopper 5 is removed, as Well as the valve [0, etc., leaving just the small hopper |4,-which may have a capacity of only from one to two cubic yards, to complete the remaining work and which can more readily fit into a smaller space in the trestle structure than the larger hopper 5.

The nipple l5 depending from the hopper I4 is connected by the reducer I6 to the pipe section I! and the latter in turn is connected by the union l8 to the pipe section I!) and the latter in turn is connected to the quick-acting valve 20. From the quick-acting valve 20 extends the pipe 2! which is threadedly disposed into the upstanding portion 22 of the inverted T-fitting 23 of the jet generally referred to by numeral 24. The externally threaded cups 25 and 26 are welded together back to back as at 21. The jet tube 28 is disposed through a centrally located opening in these cups 25 and 2B and is welded to the backs as at 29 and 30. The cup 26 is threadedly disposed into the portion 3| of the T-fitting 26, while the short pipe section 32 extending from the valve 33 is threadedly disposed over the cup 25. The compressed air line 34 connects to the valve unit 33.

The discharge end of the jet 28 terminates Within the protruding portion 35 of the T-fitting 23 and has its end cut off obliquely as shown in Figure 2. The sandblasting line 36 is threadedly engaged into this portion 35, as is clearly shown in Figure 1.

A modification of the jet is shown in Figure 4. This fitting involves an elbow 31' the upper portion of which is internally threaded to accommodate the pipe section 2|, while the lower portion is externally threaded for connection to the sand blast line.

The heel portion of this elbow 31 and which is denoted by numeral 38, has an opening therein through which the jet pipe 39 extends, this jet pipe being welded as at 40 to the heel portion of the elbow 31.

The inner end of the jet pipe 39 is cut off obliquely and terminates within the extending portion a of the fitting 31.

The outer end of the jet tube 39 extends into the socket or cup 4| which is internally threaded to receive the compressed air feed line. The jet pipe 39 is welded as at 42 to the said socket 4|.

Obviously, in this construction, the air drives in a direction at right angles to the line of sand feed and serves to blast the sand through the line 36 as it gravitates and is drawn into the fitting 23.

An air line 42 istapped to the pipe section I2 just below the valve [0 to place the column of sand in the pipe section l2 under pressure and to act on the valve to always maintain the sand in the valve I0 mobile.

While the foregoing specification sets forth the invention in specific terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.

' Having described the invention, what is claimed as new is:

In combination, a fitting having a jet therein, an air inlet to the jet, a 'sandblast outlet, a vertically extending feed line rising from the fitting, a substantially large hopper at the upper end of the feed line, a substantially smaller closed hopper adjacent the fitting, the pipe line between the large hopper and the small closed hopper being divided into removable sections, a valve in the pipe line located below the large hopper and an air supply line connected to the feed line immediately below the valve therein to place material in the line under the valve under pressure and to maintain material under the valve in a mobile state.

EDWARD J. FLAVIN. 

